These are some questions both for mainly for electromyographers.
If you get 50% correct in your answers, you have a good knowledge.
Naturally the answers can always be discussed, but the most reasonable alternative is enough.

EMG

1. In routine EMG we usually ask the patient to perform a strong contraction, and the EMG pattern is analyzed.
&nbsp&nbsp&nbsp Give a few words of argument why each of these descriptions are less than optimal:

3. Is it possible to decide whether a recorded EMG signal originates in the nerve or in the muscle ?
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4. Is there any difference in MUP parameters if the recording is obtained 2 cm or 10 cm from the end-plate?
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5. We sometimes record double discharges (extra discharges) in voluntary EMG. Do we require that the two discharges are identical in shape (amplitude, duration, phases), as a mean to separate them from occasional occurrence of discharges from 2 different MUPs?
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6. Critical illness: are fibrillations usually a sign of neuropathy (CIP)?
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7. Critical illness: is the myosin content lower in CIM than in CIP?
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8. Critical illness: is sural amplitude different in CIM and CIP?
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10. Can an A-wave and a F-response be generated in the same axon by a given stimulus (SFEMG necessary to identify the we record from the same axon)?
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11. Is there any difference in amplitudes between A-waves and individual F-responses?
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12. Monopolar recording. Is there any difference in the pattern at strong voluntary contraction if the distance between the two recording monopolar electrodes (“active” and “reference”) is 1 cm or 10 cm?
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13. Can you detect the “size principle” with conventional needle electrodes?
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14. Concentric electrode has an oval recording surface: are the MUP parameters different for transversal or longitudinal insertion of the electrode (in relation to the fiber direction)?
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15. Which is the concentric needle electrode recording uptake radius (180 or 360 degree) for the duration parameter in a MUP?
Which is the concentric needle electrode recording uptake radius (180 or 360 degree) for the spiky part of the MUP?
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16. Is it possible to make sure that you are stimulating muscle fibers directly and not intramuscular nerves in intramuscular muscle stimulation (critical illness tests)?
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17. You may stimulate one or very few axons at two different sites (prox and dist) and record a SFEMG response from corresponding muscle and so measure the conduction in a single axon.
How do you ascertain that you have stimulated exactly the same axon?
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18. SFEMG: how many spikes do you need to record simultaneously to detect neurogenic blocking?
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19. SFEMG: how many spikes do you need to record simultaneously to detect neurogenic jitter?
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20. Reinnervation. In the early stage of reinnervation (20-30 days) after a partial nerve lesion, you start to see MUPs with some jittering spikes. In general is the MUP “small” or “large”?
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21. In monopolar EMG recording you often see a small positive going signal on the slow slope of the signal, before it ends. What is this, and why do you not see that in concentric needle EMG?
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